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A monthly newsletter by Society of Broadcast Engineers Chapter 48

September 1997

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The July 1997 Meeting
The August 1997 Meeting
Schedule of Upcoming Meetings and Events
Denver SMPTE, SBE November 1997 Meeting
Are You in RFR Complaince? Washington Update
SBE SMPTE Job Postings
An Important Message to the Friends of Art Harlow
Rocky Mountain Film & Video Expo '97
Notes from the Antenna Farm

The July Meeting

Our July gathering was the annual World Famous Picnic on the Porch on Wednesday, July 16, 1997. As we have done for a number of years now, it was held on the patio outside the KWGN TV2 transmitter building on Lookout Mountain. Our thanks to KWGN for making it available and to Peter Douglas, Fred Baumgartner and Craig Roberts for talking TCI into providing lunch.

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The August 1997 Meeting

Eric Schultz, SBE Chapter 48 Vice Chair

On Wednesday, August 20, Denver SBE and SMPTE members gathered once again at TCI's National Digital Television Center in Littleton, Colorado. Members met in the Digital Diner for lunch and then proceeded upstairs to the board room for the meeting.

Chapter Vice-chairman, Eric Schultz called the meeting to order and briefly outlined the schedule of upcoming chapter meetings. The September meeting will be held at the studios of KCNC News 4. Members are to meet at 6:00 p.m. at KCNC. David Layne has made parking available in the KCNC parking lot, located at 10th and Lincoln, just south of the KCNC building. SMPTE Chair, Fred Baumgartner reminded everyone to mark their calendars for the joint SMPTE/SBE meeting scheduled for November 12th. This half-day meeting will take place on the 2nd Wednesday of November to avoid conflicts with other national trade shows. The November meeting will take place from 10:00 a.m. until approximately 3:00 p.m. in one of the NDTC studios.

Next, Rick Cabalka from ADC Telecommunications gave an interesting presentation on fiber optics technology. ADC has long been a provider of fiber optics management and termination equipment, and with the acquisition of American Lightwave Systems, has become a leading provider of the active components involved in fiber optics communications.

Rick mentioned that while fiber optics is now just starting to replace coax in cable headend systems, experiments with light transmissions date back to the mid-17th century, and Alexander Graham Bell himself conducted experiments involving communication via light! Rick discussed some of the differences between multi- and single-mode transmission over fiber. Multi-mode transmission usually utilizes an infra-red LED which introduces light into the fiber at many different angles. The signal arrives at the far end of the fiber with a slight amount of temporal separation, depending on the angles in which the individual light rays were injected into the fiber. Single-mode transmission uses a laser as a light source. The coherent light is introduced into the fiber at one angle, so the signal going into the fiber exactly matches what comes out. Using single-mode transmission, attenuation of less than 1dB/km can be achieved.

Rick also covered some of the advantages of fiber over coax, including reduced weight, increased bandwidth and reduced attenuation. Also, since fiber is primarily made from silicon quartz, it is widely abundant, whereas copper resources are being depleted. Finally, Rick talked about connectors for fiber, including the older SMA and biconic connectors, and the now popular SC connectors. Rick concluded by saying that fiber is not more difficult than coax -- it's just different.

Thanks again to Rick for his informative presentation!

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Upcoming chapter 48 Meetings and Events

WEDNESDAY - October 15th Dave Geon, Belden Wire Cable
The challenges of wiring for digital
Chapter officer nominations 12:00 noon, TCI NDTC

WEDNESDAY - November 12th SBE/SMPTE joint meeting
More details in this letter!
Chapter officer elections

WEDNESDAY - December 17th Robert Chichester, Contract Surveyors, LTD.
GPS Surveying
12:00 noon, TCI NDTC

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Denver SMPTE, SBE November 1997 Program

The Denver chapters of the Society of Broadcast Engineers and Society of Motion Picture Engineers will present a half day seminar at the National Digital Television Center, 4100 East Dry Creek Road, Littleton Colorado (intersection of Colorado and Dry Creek).

You may attend in person on Wednesday 12 November 1997 from 10:00 AM to 3:00 PM. Lunch will be provided. Please RSVP by calling Debbie Mondloch at 303-486- 3674. Non member fee is $10.00.

All are invited to attend via satellite. The program will be transmitted on Galaxy 7 C24, DigiCypher-II channel 74, fixed key. Tapes will be made available via the SBE tape library after the event.

The Program includes Peter Stymes (Tektronix/Grass Valley, and ATSC committee member), David Karlman (General Instruments/Next Level VP of new technologies), Ron Beyers (TCI's lead compression and digital encoding expert). The Keynote address will be delivered by KUSA General Manager Roger Ogden. Others to be announced.

For details and updates, please call Fred Baumgartner at 303-486-3946


12 November 1997 Wednesday

10:00 AM - Opening Address -- Peter Douglas
10:10 - 1st Speaker -- David Karlman, GI
10:55 - Break #1 Video Roll In -- NDTC tour tape
11:10 - 2nd Speaker -- Peter Stymes, Tektronix/GV
12:05 - Lunch ( Video Roll In )
1:00 - Keynote Address Roger Ogden, KUSA
1:20 - 3rd Speaker -- Ron Beyers, NDTC
2:05 - Break -- Video Roll In -- Titan Tour tape
2:20 - 4th Paul Depperschmidt, Faroudja
3:05 - Adjournment

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Are You in RFR Compliance? Washington Update

Andy Butler

(This is an excerpt from the Broadcast Electronics Winter Exciter newsletter, reprinted with permission.)

You didn't see it in the stack of boxes you unwrapped, the FCC gave broadcasters a nice holiday present this year (1996). On December 23, the Commission extended the deadline for broadcast applicants and licensees to determine if their facilities comply with the new requirements for RFR exposure. In 1985, the FCC first adopted rules for evaluating the environmental effects of RF electromagnetic fields produced by the various services they license. In August of 1996, the Commission adopted a new set of guidelines and methods for making these evaluations. The new procedures were scheduled to take effect on January 1, 1997. After considering (a number of arguments), the Commissioners voted to delay the transition until September 1, 1997.

The new rules are based on the ANSI/IEEE standard developed in 1992. These basic guidelines were enhanced using methods developed by the National Council on Radiation Protection and Measurements.

The FCC's 1985 manual on RF exposure is now obsolete and should be discarded. One reason for the delay in implementation is that its replacement, OET Bulletin Number 65, was not available before the January 1 deadline.

Determining which facilities have to comply with the new regulations is easy. All Radio and TV Transmitter sites are included along with Satellite Earth Stations that are capable of transmitting. Broadcast Auxiliary, FM Translators and Boosters are included if their output power exceeds 100 watts effective radiated power.

Deciding which standard applies to a particular installation is a little trickier. There are two standards for exposure under the new guidelines.

Occupational/Controlled Environment standards are used for areas where exposure is a result of job juties and workers can control the length and level of their exposure. The caution is that workers must be fully infomed of the exposure and trained to understand the consequences. This can be done in verbal briefings or written manuals but posting appropriate warning signs at the site demonstrates that the information is readily available. Higher power mobile or portable devices should also be prominently tagged unless they are equipped with push-to-talk microphones.

The General Population/Uncontrolled Environment standards apply to areas where the general public may be exposed or where workers are not fully aware of or cannot fully control their exposure. These might include public areas of a radio station or homes located near a tower site.

Two factors determine the compliance of a particular broadcast site, whether the location is occupational/controlled or general population/uncontrolled and the frequency of the transmitter(s). The limits for the Maximum Permissible Exposure for Occupational/Controlled Exposure are the following averaged over a six minute period:

Band              Electric         Magnetic               Power 
               Field Strength    Field Strength          Density

AM Broadcast      614 V/m           1.63 A/m             100 mW/cm2  
FM Broadcast      61.4 V/m          0.163 A/m            1.0 mW/cm2

The limits for Maximum Permissible E#xposure for General Population/ Uncontrolled Exposure are the following averaged over a 30 minute period:

Band              Electric         Magnetic               Power 
               Field Strength    Field Strength          Density

AM Broadcast      614 V/m           1.63 A/m             100 mW/cm2  
FM Broadcast      27.5 V/m          0.073 A/m            0.2 mW/cm2

There are a number of ways to comply with these requirements. They include restricting access, planning work procedures carefully, installing RF shielding, posting warning signs and controlling the length of exposure. The use of protective clothing may be required and carrying a personal monitor can protect personnel and limit employer liability. The station can also reduce operating power. Obviously some situations will require a combination of these methods. At a shared site, compliance is the joint responsibility of all licensees whose transmitters contribute more than 1% of the overall hazard.

If the licensee is satisfied that a facility complies with the regulations, no further action is required. It is a good idea to keep a record of how the compliance determination was made and recheck the determination when significant changes are made in the facility. If the facility does not comply, an Environmental Assessment must accompany the application for a new facility or a renewal.

These suggestions are casual. Please be certain to study the new OET Bulletin No. 65 or consult a qualified consulting engineer before assuming that your sites comply.

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SBE/SMPTE Job Postings

As a service to Rocky Mountain regional SBE/SMPTE members, technical and production oriented job postings are published at no charge.

Please send postings to:

Rome Chelsi
IHS Communications Products
15 Inverness Way East
Englewood, CO 80112-5776
Fax: 303.486.1700

KSL TV & Radio, Salt Lake City, have numerous positions available, call the job line at (801) 575-5780

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The following SMPTE members have been eliminated as "no shows" by SMPTE national. If you see them, please encourage them to renew:


We'll miss them.

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An Important Message To The Friends Of Art Harlow

(The following is a press release from KMGH TV Channel 7 dated August 10, 1997)

It is with deep sadness that the family of Art Harlow and 7NEWS (KMGH-TV) inform you of his untimely passing Saturday August 9th. Art lost his valiant fight against cancer.

During his 30 year career in Radio and Television Broadcast Engineering in Denver, Art touched many of our lives with his witty sense of humor and brilliant creativity of innovative technology. This communication was the only way we could notify everyone in the media community of this tragic news. Art was a friend to everyone he ever worked with.

(Ed: A memorial service was held on Tuesday, August 12th.)

At Art's request, in lieu of flowers he wanted people to make memorial contributions to either the St. Anthony Flight for Life program or the Rocky Mountain Cancer Institute.

The family wishes to thank everyone for their support and prayers during this most difficult time. The family is also most grateful for all the well wished and warm thoughts extended to our father during his long illness. He really enjoyed the visits, cards and phone calls. We feel so lucky that Dad had so many wonderful friends.

He has gone to a better place, but will not be forgotten. Art was a true "one of a kind".

"So there".

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Rocky Mountain Film & Video Expo '97

The sponsors of The Rocky Mountain Film and Video Expo would like you to join them Wednesday, October 1, 1997 from 4:30 - 7:00 pm for a Keynote address by David Layne of Denver's Channel 4 and Sneak Peak Reception. The Keynote wil be held at 4:30-5:15. The reception will be held on the exhibit floor of the 13th Annual Rocky Mountain Film and Video Expo, beginning at 5:30 at the John Q. Hammons Convention Center, I-70 and Chambers Road.

Admission to the event is $15.00, however, the event sponsors - Burst Communications, Ceavco Audio Visual, Davis Audio Visual, Film Video Equipment Service Co., and Waxman's Industrial Network - would like to make complimentary exhibits passes available to you and members of your association at no charge.

To request your pass, which includes complimentary food at the Sneak Preview Reception, free admission to the Keynote presentation of KCNC TV's David Layne entitled "Ramping Up to Digitol Television", admission to the Rocky Mountain's largest film/ video exhibit of the year, and free admission to the Short Takes Seminars in the Seminar Pavilion educational display, call ExpoMasters at (303) 771-2000

For further information:
Contact: Mark Cramer Phone (303) 771-2000
FAX (303) 843-6232

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"Notes from the Antenna Farm"

Chapter 18 - Philadelphia

There I was, Watching the Sunday Morning NBC-10 News, when the picture looked very familiar, and the audio said it was our town. Then it was our apartment complex. Yes, this is what caused that big flash, loud explosion and one second power loss the previous night.

It seems that a utility pole which rotted at the base, fell against the side of the building, the pole transformer opened up and oil spilled down the side of the building to the ground. Some oil got into the apartment on the second floor. PECO referred to the hour outage as a quote, "rare event", end quote. They advised that the poles are inspected annually and every 3 years some kind of preventive maintenance is performed. and investigation was continuing as this article was written.

The 3rd floor tenant was in bed at the time. She had still not gotten any sleep the following afternoon. That explosion must have scared the Daylights out of them. Even we in this business would call it an experience.

Which is one way of saying that we must inspect and inspect. Defects can be missed. Yes, this just might be a good time to go over everything again. How about that base and base insulator, the wiring, the lighting path and guy insulators. Where are those field lenses? and, Lets go out to the street to check the utility poles and wiring and the near by substation. By the way, if you hear buzzing on you car's AM radio when you pass a pole transformer, the utility company will appreciate knowing about it. This is a developing problem.

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Society of Broadcast Engineers
Chapter 48

2950 South Birch Street
Denver, Colorado 80222

SBE Officers

Andre' Smith (303) 871-4204

Eric Schultz (303) 486-3872

Bill Harris (303) 756-4843

Certification Chairman
Fred Baumgartner (303) 486-3946

SMPTE Officers

Fred Baumgartner (303) 486-3946

Rick Craddock (719) 634-2844

Myron Olinger
Dick Phannenstiel
George Sollenberger

SMPTE Govenor (National Liason)
Rome Chelsi

Newsletter Committee

Bill Harris.......(303)756-4843 email:
Garneth M. Harris..(303)756-4843
Andre' Smith.......(303)871-4204 email:

Views expressed herein do not necessarily reflect the official positions of the Society, its officers, or its members. We regret, but are not liable for, any omissions or errors. The Denver SBE & SMPTE Newsletter is published approximately twelve times per year. It is prepared with a combination of text and graphic data. Submission deadline is 10 days before the last day of each month. Other SBE chapters are permitted to use excerpts if attributed to the original authors, sources, and/or the Denver SBE Newsletter.